Each Hahnemühle Sketch Book contains high-quality, thick papers with a rough surface for pencils, Indian ink, pastels or watercolours - you should opt for smoother papers if working with pens. Available in convenient A6 and A5 formats, larger A4 and A3, and even square sizes to fill every consumer need. The Hahnemühle sketch books are available spiral-bound or thread-bound, with an elastic band to hold the covers shut. Additionally, the books feature a small pocket inside the back cover to hold loose papers, mementos, or other items.